There's more inertia than most people realize.
Changing a time or date system is Hard. People use that far more than they use linear measurements. Over the ages, several governments have tried to meddle with calendars. In the end, the only changes that worked are the ones that were heading towards our current Gregorian system.
Measurement of Time would have a bigger problem! There was an electronics kit many years ago from one of the hobby stores in Australia which displayed Decimal Time. It was clear that this was nothing more than a noveltty, though in typical electrical engineering fashion, was a fully working novelty. I believe it gave a day 10 hours, an hour 100 minutes and a minute 100 seconds. Such seconds were 0.864 of a traditional second.
Wade.
